AMT Corrosion Control and Treatment 2

Question 1

Which type of corrosion is most commonly found between mating surfaces of dissimilar metals?

Accepted Answer

Galvanic corrosion

Answer

Uniform surface corrosion

Answer

Intergranular corrosion

Answer

Exfoliation corrosion

Question 2

What is the primary purpose of alodine (chromate conversion coating) treatment on aluminum?

Accepted Answer

To provide corrosion protection and improve paint adhesion

Answer

To increase structural strength

Answer

To provide a decorative finish

Answer

To seal existing corrosion products

Question 3

Intergranular corrosion in aluminum alloys is most dangerous because it:

Accepted Answer

Attacks along grain boundaries beneath the surface with little external evidence

Answer

Produces visible staining on the surface

Answer

Only occurs in tropical climates

Answer

Is easily detected by visual inspection

Question 4

When removing corrosion from an aluminum aircraft structure, which abrasive should NOT be used?

Accepted Answer

Steel wool or steel wire brushes

Answer

Aluminum oxide abrasive cloth

Answer

Non-woven abrasive pads rated for aluminum

Answer

Fine-grit wet/dry sandpaper

Question 5

What does the term 'anodic' mean in the context of the galvanic series?

Accepted Answer

The metal is less noble and will corrode preferentially

Answer

The metal is more noble and resists corrosion

Answer

The metal is immune to corrosion

Answer

The metal acts as a cathode in the reaction

Question 6

Which corrosion type produces a white or gray powdery deposit on aluminum surfaces?

Accepted Answer

Uniform surface corrosion (oxidation)

Answer

Crevice corrosion

Answer

Filiform corrosion

Answer

Stress corrosion cracking

Question 7

Before applying a corrosion-inhibiting compound (CIC) to an aircraft structure, the technician must ensure the surface is:

Accepted Answer

Clean, dry, and free of active corrosion products

Answer

Wet with water to activate the compound

Answer

Primed with zinc chromate regardless of metal type

Answer

Heated to at least 150°F to open the pores